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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a7267be55b11887c07d876978959832c0ed23bcf7b3ca4838feeaf211007d5' 
  AND token = 'e1gefI6rUvy7/8iVURa/V7um14veULOn3Wl5vKQ6pYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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