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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c1e0901172698cfaeccadc2666d20847bbb014a2a8fd5999daf1aa2f278d48' 
  AND token = '2ewLazrQuXrZ1crBmBCSMye//5pDvXD0HxLZLH+C3ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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