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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5a8816486da89f836ae92282ef25d66a984db0a1f48ab924736aca99094fc0' 
  AND token = '9iadZ1agpOSqUYYycjzzoY5gKp+JXMhSa+gXIldcCXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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