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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2710a0b33d36b24ee55707e7bffb0d5e91fa2e55a2f2152720f9ab61b4ab3f6' 
  AND token = 'utYxnysNN61HNr4RWYdVyNjJx/NhSlEQ0g1Niyk2tCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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