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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7311b2657d1a763c1706a64a2e99c8a6c57e3d79df3f7deb2fbfbc8ed746e9d' 
  AND token = 'ijU6Y3NFBdNG/fmezB0rD7cDrkWGHPVmxqqbr9YKKjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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