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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93dfcf8695a182795f59fc9d66aee44ed22f320363b353acff855250222ac791' 
  AND token = 'mX2HebXbArO+hJu3Z+6ETeaz8mt6HOt6+1ee7frP+Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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