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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c403e5963396ba62143a97ccaad3786a5fbcc9bb17413d9f507a16e51143c89c' 
  AND token = '/eFxMXs81/hXuc7HdRe+6KKSFdcUG6V0PYQaFhArAew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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