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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619b3d9630d190f5d451e2adfa6c8b0c0235c324fc9f2f7fc7a954769882532b' 
  AND token = 'e6S9rcznT2a9hHoPXRmegpm3jEq6nPIFyMan1HsOePY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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