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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ae91ea8ba90a2080117ecfcf71208cb19b9b9175402299ab68f4d1ff2a5a17' 
  AND token = 'xM49erJjy6dpbpqoPogqVJukzhsOiVPc9svOzTmN3hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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