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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00268edd7c2250e40111f413ab603e942245afd447abd71b87efa46320f1f05' 
  AND token = 'ditfK7zfd9UIk723Fc9yZBiC2DTu90L/cjU+VHXFIcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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