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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7b0581ceb507bba0811e2c4740830507f293ccfbf89e7c2c88f4f8af6bb4e2' 
  AND token = 'kIKgRK7MRyz8skd8ypcM3tAGdGD958QhKYxRgRQ83cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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