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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59bc7b477d0eb41871960744ba88d17473d930903c2fec584c9d6fdbb33b14aa' 
  AND token = 'gJuWeHvreQP8LnfWJihtwmr4eD3WfqELYv/lsD7yyto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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