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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1f689f0da9a5b0f16b390038af683baf4f10f7ffba50ec59cec1a470840b87' 
  AND token = 'jc1gf54xvsCG3wUK60ld2374zFTOFkC/jW/Ncr27H0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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