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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05434e5e146010359694c9d5ca27ffe927b637105931131d45b178e81c46cf6' 
  AND token = 'Bt0hf7z5TT1mdb2OGh6Pr35KQ11iDxpWr3lerGUKdfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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