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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023a592160c197ef6932324112410545686be1c732292df1c0885620821ddd57' 
  AND token = 'Ra68wQ8cFvZXD34cA+oDpC/p4Ml2oLFL7MhEHG/lS8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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