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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0759ee2b4c8285891ff7c5b351ef4c2610e9eba5a168e5afae4e88ed468d4113' 
  AND token = 'PHrwx7+eaFnKL/jMnkISQ4DSh70G1bMHkbj4hoeZ9AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}