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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eafd1d9545d3525f89894e1ff13b1f9cc9639da90690c9bdb676fefc43f67aa3' 
  AND token = 'AoGOYvyBSL+QPU1JnXy3iIQddDQOkBuuRsp4Tv1GPCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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