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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970d36d045443e802fb46b7e6030c6de35eb9598aca449d80340071f0412a02b' 
  AND token = 'OssmkX7uMB6fr2q9CD5BVPEArkxI+/GKuFmCnu8cILs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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