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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84a542d12d420eece90d350c31c73589fcd85a22480cb645daa886c9994a4bc' 
  AND token = 'LQ+1PEt1UXhvhP3WPk28N4oPNsKyYkr038/gZJcDU/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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