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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba769e7d4d44c3f7dbb95fe0ff2e47343895def9e4a93d90255cba0cce7f3fd3' 
  AND token = '+g7kSq9fDwxOQJ/EU2tOjX08s3wJG0SpquiryDL6Mrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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