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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ab3ef8899a37615a832b669d7cbfbd239102acaad3984ab546af0c14fd5ae3' 
  AND token = '3OYBuMkt80BzgsgZ3ozK5/mROues7Jv2kqyeg3si1eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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