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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f685eaa6c6bf6661bd4a414dc060f7fc60b86d6869886cdea666a7dd839e9238' 
  AND token = 'JMz980+YpAnf4B4Ygx9Si2oRvEd1299tfgjCoGOF5WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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