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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2db661fb2d64130ee5b70d96264f45eade7d01c5b1550770ae2c99629491c2' 
  AND token = '7EF11QsLoD2FcoAQiP6jITTp6wgMxATFwdm3JVfAA2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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