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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d43a8d95761326730449c4d70b2e5d905ec7a04a0b0d92149342208fea192bc' 
  AND token = 'aml4vfSz9Nf55wu+0rrCA9WAAkp/fu5tieUuwK+uZlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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