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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0dd05313c2fe9befc91d9f2fa4ee3a9d605eb19edd377e4960c2d72461d6922' 
  AND token = '93ZghGJEjof/3Sw3Ud2rSucVhzpSGQy5BW3T+uRx69A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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