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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499e86757b1482bbad652554b088b5f5ef6fb112b14ce2868327e69c09c4769b' 
  AND token = 'hcfWCwXljx2ElNDb7yQbsbNJMWJwZYuZr74jV0BOCFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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