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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883c529beaf211a4c1c6fbc48cd528e40f55ef0ae7944e2ffdfcf36350daf15f' 
  AND token = '7VKEiQGlmXoi9PfD7XIoN/TwwOvM8V7Qf/hjig96laE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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