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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547a9b9fc0c8a0c4eb2673982c5ff5d4a07f76fa9bc819c527c0b4e184b8588c' 
  AND token = 'HVB4vdph0zaRMKPZMDmNF4MSgZbZVC+dDDOTR/5P5OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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