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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7b387991dbb610a6b1c16532e0442aee548747a4199257c49b3dcdc0355eb9' 
  AND token = 'uwtCq2rdg7Eqxqtb53KN24f7gUnRTclekUBv4SZQJgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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