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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5133fd2826cbaaea1b82655f6575f8a47d3fb7c8e638782be2d1b788e53db33c' 
  AND token = 'eolFlU3rThlBBrznk2z19+41X85Nrpua6eYr5xnt5Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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