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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212efe008c7cf4371574a84a799a020b91174d58b41a8974cac889146450deae' 
  AND token = 'BNdhHjkvjc7PoUjn2D/l0c+QAV1YsL7Zv1diidnREIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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