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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa177de2687e028180a0ba90af8d78cb78d3760003fe8c9ac3d1caededc9731b' 
  AND token = 'Erl0AJWtBuErGwUApybOD0ftF/CmvXCvmrxtmMafx08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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