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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7382ce0b855c68b30987d7793944411e340749e9a7e5568b1705b4a49f95dba6' 
  AND token = 'TNAS5XEkOwu6im2q1hlWI5LlQX2iZs7UYzX4k2i/hLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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