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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff3f3820970ef9082d834f0f07622e934ad61717ba0ef7025030aaf297e3129' 
  AND token = '+MUYrbxQLzlYecYhaTT3TD8QMuW5vi+z3neI1IbDRJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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