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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58a63202c41968af91b7a7fb3d52c18c0dd74546c0f0a4e46a48b6f8c4e34c6' 
  AND token = '4ZBUexm4rxvHfdjb+NfOjWCGl2qgq3x93aHHsp4g+zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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