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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebfee3de6bcb4fbca081c93210a6c916b4e2e5e14bdc823773d389d76725cc70' 
  AND token = 'LB3NqPOaCS1jaQqzaR35P9+cGKetM0948LCCJWh3JtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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