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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32aac806c74f41c8a4e0f6d4784e24d61f7cfdf1e7dea1cb1b084958dea40018' 
  AND token = 'E7lLzipGUOO1fe7pOmFkj+EY6xQ5lui+nnTCV987O5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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