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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a44e5a8553118e42a299571c2872767dd9a2422bcc59ff964907425a947d6d' 
  AND token = 'R8aAOby5JF6hYYU3FoA2h+YFx/uBaKq+rD+Q4ZVJoDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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