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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ac3cc8de2eef7507b9280b4337d9409d8376c3e6a258c4f793b2db1874acb5' 
  AND token = 'ubpfTTQ2XMgJTaTs9CMK5U2SiROzEQ3Ljc/RqUtzNAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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