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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e883457445906d51ac7b6d9f1afa1398e50aac60310e653d226a712c8f28cf' 
  AND token = 'Zm0sY4lxjbcZx96pr1tTPEV7U3C2rXllOXr/1L/RiTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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