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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5a7353c90def4101f8f7a52032214653df976e35bc491b345ba15a36d2943c' 
  AND token = 'sNxVeYMLBQbpeflkZ891Rk2rUkwUilll6lyuekITxkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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