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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32184dc56b9b15827fc6d0a4a6605013ba07f0f028c4b982fbe2892bc510045c' 
  AND token = 'gv2Y/dWGD2iziu/RbCMXEq/ycubJaaPWxkcWUqDoswg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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