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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b7afa4d239ec2fead9062ebb644d59b44b41fb09b11a364f19199e8d868b09' 
  AND token = 'zcaVn/tWzAPloGuH3UYmva9kJjECz4gX3Rzve/D8zaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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