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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f19c309694bfeebb0e63dc486116048777608f8e6fbb90e47d5b2f654995a7' 
  AND token = 'Cn7QdVvQ/a3pyNt5gCnIx695dv80NIItwOjz6LPP14k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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