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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f83a96036f343a64cc3c38d853dc9e3ee43994a84196f8614da93ee6572dd71' 
  AND token = 'Hw7JlwFHxGsWbcpP+TJBGEvlXk2F27w5rx31gPZdFWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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