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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb8cd847b5d2bd7dee847886f65fbfb01b1daec30064a8ceb936d87e75d10d6' 
  AND token = 'm/mtw70x40bac1eJ62cdd3maBCW0U8uk8GmNhvyA/ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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