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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba626939dbc28dad5d7a875b69eaa196428d2fed472ead6b3470994ec95749e' 
  AND token = '9fEqopsYDiu5TYrc8oqg4Z6/6bZk998b0mG4qJjZdM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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