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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9862f03c75c4c2f0914b667886ab15d446c18bb53f5fae601342bfad1af891a0' 
  AND token = 'UiOvEp9rv6vx957Fhp/x7EaAABN6blC0NR4sYXRgaY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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