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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa8037b12a620026dd7f97899a2b1ad9761c5245376597770605752df9d327b' 
  AND token = 'z2ZiUesGcgoO3U1GeorkBa6dcTJFIo8GfF/V6VBJytg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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