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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bf68949712c531445e4d3aa1b2a0f912903c8a29c80c4623e62b62f4dfa3f4' 
  AND token = 'WHgymmuX794WmT9LKugh6iqn7DPdb7Ij8VrDR4w+lrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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