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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '467b6dc967f906de4d93c53febe812c18c70b9cda3784d699ea757994b807fdc' 
  AND token = 'f0kMgJuG6FHGd3VHKLVqa7y9vQcktg11btVCFVirzlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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