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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e03d32698d8a72e0a577fbcc76c68265209942ae379be3e1775058a7bf27bbba' 
  AND token = 'hmRrxlRGCnuTjkKewgWXtCm0wvIiADSWyuUerfIc214=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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