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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64277c0a68e6c2450f2bbdcf308c27f2bb4e35273042d7e659fa168867ba961' 
  AND token = 'C1gSmKvDTLUMlkP7brQgJ7Id09bWrAnFVOraym31AN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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