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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd91e11e8a003f642157ae0b389ef3ff65e6c683582a90b7b3a1cc3c8e2e49e5' 
  AND token = 'qb9T+ps49gw3CC5oc+cOrfy/dPK1F8VeQ3UIBFIuBmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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