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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4918b4fe387baf8e3995c71a9fd60b2c9a8582f58c1bfa420537f5439d6b8f85' 
  AND token = 'UBz4VAQ+6ixjCdUrhDgv2cafSy8l9GuUMbyC2cdtq2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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